It doesn’t always use the selection you make to verify your humanness. It cat actually tell because a bot will either select completely random answers, not make any selections or make selections in such a quick, predictable patter that no human will act like that.
Plus, these usually prevent repeat access from robots so if 1 in 3 have known answers then most robots that can beat the rest of the captcha can only access 3 times before it is stopped.
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